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p² = d² - (R+)²
12² = 15² - (6+r)²
144 = 125 - (6r)²
gitu...
tinggal menghitung saja jumlahnya brp udah selese
12² = 15² - (6 + r2)²
6+r2 = 9 -> -> 6+r2 nya pindah ruas.. hasil 9 tsb dari tripel 3,4,5 mjd -> 9,12,15
r2 = 9-6
r2 = 3 cm
**maaf kalau salah